Corrosion-proof covers for pressure vessels



June 1955 F. SCHAEFER ET AL 2,711,341

CORROSION-PROOF COVERS FOR PRESSURE VESSEL-S Filed Jan. 1'7, 1952 INVENTORS: FRIEDRICH SCHAEFER WILHELM MAYER- ATT'YS United States Patent O CORROSION-PROOF COVERS FOR PRESSURE VESSELS Friedrich Schaefer and Wilhelm Mayer, Ludwigshafen (Rhine), Germany, assignors to Badische Anilin- & Seda-Fabrik Aktiengesellschaft, Ludwigshafen (Rhine), Germany Application January 17, 1952, Serial No. 266,854

Claims priority, application Germany January 25, 1951 7 Claims. (Cl. 220-63) This invention relates to corrosion-proof covers for pressure vessels intended for use as containers for corrosive materials.

In reactions which proceed under pressure and at elevated temperature and in which the material used for the manufacture of the reaction vessel is attacked, a special protection against corrosion is necessary, as for example by the use of special stells or noble metals or lead, copper or the like. While no particular difficulty is attached to providing this type of protection in the case of the cylindrical part of the pressure vessel, as it may readily be effected for example by the insertion of a corrosion-resistant lining tube or a steel tube plated with a corrosion-resistant material, it is more difiicult to provide for a satisfactory protection of the cover, mainly because the cover must usually be provided with tubular v by a homogeneous application or brazing of the corrosion-resistant material directly to the cover, but for this purpose it is usually necessary to heat the cover and in very many cases this is difiicult to carry out and is uneconomic by reason of its great weight in the case of pressure containers. In the case of annealed cover materials, it is also necessary to carry out a second annealing which in turn again has an ingenious effect on the protection against corrosion. Moreover, a direct application of the protective material to the cover has the disadvantage that a defect in the protective layer may not be observed until after marked corrosion of the cover itself has taken place, whereby at the same time an escape of reactants, as for example gases or liquids, can take place and in some cases, for example in the case of poisonous gases, this may be dangerous. Furthermore, for operational reasons, it is preferable to arrange the connecting pipes which are usually led through the cover so that they may be placed in position and removed without dismantling the cover.

We have now found that an etfective protection of the cover of a pressure vessel against corrosion, a good control of the said protection and a ready exchangeability of connecting tubes without removal of the cover are possible by an arrangement as hereinafter described with reference to the accompanying drawing.

The lower side of a cover 1 of a pressure vessel is provided with a plate of corrosion-resistant material or a plate 3 plated with a corrosion-resistant material 2 which has a tubular extension 4 (or more than one such tubular extension if necessary) which projects to about the middle of the thickness of the cover 1. The plate 3 is drawn tightly against the inner surface of the cover 1 2,711,841 Patented June 28, 1955 by tubular nut 5 and if desired by bolts 6 from the exterior. A connecting tube 7, which either consists of a corrosion-resistant material or is plated therewith, is passed from outside into the cover 1 and is tightened against a seating on the tubular extension 4, which may for example be lenticular or plane, the seating being about in the middle of the thickness of the cover 1. Pressure on the seating is effected by screw pressure, for example by means of a sleeve 8 having a flange 9 and a bolt 10, the tightening preferably being such that the sleeve 8 is pressed by the bolt 10 onto a lenticular or fiat seating on the tubular extension 4. The arrangement of the packing at about the middle of the thickness of the cover has the advantage that temperature differences between the cover 1 and the parts 4, 5 and 8 cannot adversely affect the packing. By providing grooves 11 in the plate 3 on the side opposite to the plating 2 and vertical grooves 11 in the tubular extension 4 and the tubular nut 5, a defect in the corrosion-resistant layer may be readily detected without the opportunity being given for the escape of large amounts of gas or liquid. The longitudinal grooves may also be replaced by helical grooves in the extension 4 and the tubular nut 55.

The drawing is given merely by way of example and the apparatus therein shown may be modified in various respects.

What we claim is:

1. A corrosion-proof closure assembly for pressure vessels comprising a cover provided with a hole therethrough, a corrosion-resistant plate on the inner surface of said cover provided with an opening in alignment with said hole, a corrosion-resistant tubular socket secured to said plate and having a cylindrically shaped bore and extending into said hole, said bore registering with said opening in said plate, a tubular nut member extending into said hole from the outer surface of said cover and en gaging said socket for exerting tension on the latter, the said cover closely enclosing said socket and said nut member within said hole, the assembly of said nut member and said socket having an enlarged cylindrically shaped bore from a point intermediate the said surfaces of said cover to the outer extremity of the last-named assembly providing an annular shoulder on the assembly adjacent the bore thereof, a tube removably extending through said last-named bore, an annular rim on the outer sur face of said tube and adapted to seat on said shoulder, a tubular sleeve slidably surrounding said tube and adapted to abut on a surface of said rim opposed to the surface thereof adapted to seat on said shoulder, and means for causing said sleeve to bear on said rim.

2. A corrosion-proof closure assembly as defined in claim 1 wherein the plate and the tubular socket are wholly made of corrosion-resistant material.

3. A corrosion-proof closure assembly as defined in claim 1 wherein the plate and the tubular socket are provided with a corrosion-resistant plating.

4. A corrosion-proof closure assembly as defined in claim 1 additionally including bolt means for securing the plate to the cover.

5. A corrosion-proof closure assembly for pressure vessels comprising a cover provided with a hole therethrough, a corrosion-resistant plate on the inner surface of said cover provided with an opening in alignment with said hole, a corrosion-resistant tubular socket secured to said plate and having a cylindrically shaped bore and shaped bore from a point intermediate the said surfaces of said cover to the outer extremity of the last-named assembly providing an annular shoulder on the assembly adjacent the bore thereof, a tube removably extending; through said last-named: bore, an annular rim on the outer surface of said tube and adapted to. seat: on said shoulder, a tubular sleeve slidably surrounding said tube and adapted to abut on a surface of said rim opposed to the surface thereof adapted to seat on said. shoulder, means for causing said sleeve: to bear on said rim, said plate, said socket, and said nut member each being. provided with grooves on the side of each adjacent said cover, and means cooperating with said grooves providing a fluid path therefrom to the outer surface of said cover for. the detection of a leak in the assembIy of said plate, said socket, and said nut member.

6. A corrosion-proof closure assembly for pressure vessels comprising a cover provided with a cylindrically shaped hole therethrough, said hole. having an. enlarged cross-section from a point intermediate. the inner and outer surfaces of said cover to the outer surface thereof providing an annular shoulder on the cover adjacent the hole, a corrosion-resistant plate on the inner surface of said cover provided with. an opening in. alignment with. said hole, a corrosion-resistant tubular socket secured to said plate and extending into said hole and terminating at a point intermediate the said cover surfaces, the bore of said socket registering with said opening in said plate, a tubular nut member extending into said hole from the outer surface of said cover and engaging said socket for exerting. tension on the latter, said nut member being adapted to be supported by said shoulder, the said cover closely enclosing said socket and said nut member within said hole, a tube removably extending through said nut member and said socket, an annular rim on the outer surface of said tube, said nut member and said rim being adapted for seating the latter on the end of said socket nearer said outer cover surface, a tubular sleeve slidably surrounding said tube and adapted to abut on a surface of. said rim opposed to the surface thereof adapted. to seat on said socket end, said sleeve being. adjustably fastened to. said cover at the said outer cover surface, and means for causing said sleeve to bear on said rim.

7. A corrosion-proof closure assembly for pressure.

vessels comprising a cover provided with a cylindrically shaped hole therethrough, said hole having an enlarged cross-section from a point intermediate the inner and outer surfaces of said cover to the outer surface thereof providing an annular shoulder on the cover adjacent the hole, a corrosion-resistant plate on the inner surface of saidcover provided with an opening in alignment with said hole, a corrosion-resistant tubular socket secured to said plate; and extending into said hole and terminating at a point intermediate the said cover surfaces, the bore of said socket registering with said opening in said plate, a tubular nut member extending into said hole from the outer surface of said cover and engaging said socket for exerting tension on the latter, said nut member being adapted to be supported by said shoulder, the said cover closely enclosing said socket and said nut member within said hole, a tube removably extending through said nut member and said socket, an annular rim on the outer surface of said tube, said nut member and said rim being adapted for seating the latter on the end of said socket nearer said outer cover surface, a tubular sleeve slidably surrounding said tube and adapted to abut on a surface of said rim opposed to the surface thereof adapted to seat on said socket end, said sleeve being adjustably fastened to said cover at the said outer cover surface,

means for causing said sleeve to bear on said rim, said plate, said socket, and said nut member each being provided with grooves on the side of each adjacent said cover, and means cooperating with said grooves providing a fluid path therefrom to the outer surface of said cover for the detection of a leak in the assembly of said plate, said socket, and said nut member.

References Cited inthe file of this patent UNITED STATES PATENTS 161,845 Wiesebrock Apr. 6, 1875 332,096 Mathieu- Dec. 8, 1885 485,810 Curtis et a1. Nov. 8, 1892 528,400 Stebbins Oct. 30, 1894 969,205 Shields Sept. 6, 1910 1,072,208 Dahl Sept. 2, 1913 1,805,155 Weeks May 12,. 1931 2,306,275 Murray Dec. 22, 1942 

6. A CORROSION-PROOF CLOSURE ASSEMBLY FOR PRESSURE VESSELS COMPRISING A COVER PROVIDED WITH A CYLINDRICALLY SHAPED HOLE THERETHROUGH, SAID HOLE HAVING AN ENLARGED CROSS-SECTION FROM A POINT INTERMEDIATE THE INNER AND OUTER SURFACES OF SAID COVER TO THE OUTER SURFACES THEREOF PROVIDING AN ANNULAR SHOULDER ON TE COVER ADJACENT THE HOLE, A CORROSION-RESISTANT PLATES ON THE INNER SURFACE OF SAID COVER PROVIDED WITH AN OPENING IN ALIGNMENT WITH SAID HOLE, A CORROSION-RESISTANT TUBULAR SOCKET SECURED TO SAID PLATE AND EXTENDING INTO SAID HOLE AND TERMINATING AT A POINT INTERMEDIATE THE SAID COVER SURFACES, THE BORE OF SAIC SOCKET REGISTERING WITH SAID OPENING IN SAID PLATE, A TUBULAR NUT MEMBER EXTENDING INTO SAID HOLE FROM THE OUTER SURFACE OF SAID COVER AND ENGAGING SAID SOCKET FOR EXERTING TENSION ON THE LATTER, SAID NUT MEMBER BEING ADAPTED TO BE SUPPORTED BY SAID SHOULDER, THE SAID COVER CLOSELY ENCLOSING SAID SOCKET AND SAID NUT MEMBER WITHIN SAID HOLE, A TUBE REMOVABLY EXTENDING THROUGH SAID NUT MEMBER AND SAID SOCKET, AN ANNULAR RIM ON THE OUTER SURFACE OF SAID TUBE, SAID NUT MEMBER AND SAID RIM BEING ADAPTED FOR SEATING THE LATTER ON THE END OF SAID SOCKET NEARER SAID OUTER COVER SURFACE, A TUBULAR SLEEVE SLIDABLY SURROUNDING SAID TUBE AND ADAPTED TO ABUT ON A SURFACE OF SAID RIM OPPOSED TO THE SURFACE THEREOF ADAPTED TO SEAT ON SAID SOCKET END, SAID SLEEVE BEING ADJUSTABLY FASTENED TO SAID COVER AT THE SAID OUTER COVER SURFACE, AND MEANS FOR CAUSING SAID SLEEVE TO BEAR ON SAID RIM. 